内原行星盘中尘埃体的光诱导解体：行星形成的意义
Light-induced disassembly of dusty bodies in inner protoplanetary discs: implications for the formation of planets
摘要：
实验室实验表明，固态温室效应与热泳相结合，可以有效地侵蚀粉尘床在低压气体环境。被照亮的、吸收光的尘埃物体的表面比表面以下的尘埃温度低（固态温室效应）。这种温度梯度导致气体和尘埃颗粒之间的定向动量传递，并且尘埃颗粒受到朝向表面的力（热泳）。如果热泳力比重力和凝聚力强，尘埃粒子就会被喷射出来。应用于原行星盘，尘埃物体小于几公里的大小，接近一个恒星比约0.4天文单位的是受到快速和完全解体的亚毫米大小的尘埃聚集通过这一过程。当一个向内漂移的尘埃体被摧毁时，产生的尘埃不会因为升华或随后的吸积到恒星上而消失，而是可以通过电泳或辐射压力进行再处理。星子不可能起源于侵蚀带内的尘埃聚集。如果已经存在大于几公里的天体，它们就会占上风，并通过收集较小天体解体后的尘埃而进一步增长。一般来说，在圆盘内部有限区域堆积的固体物质促进了行星的形成。正如TW Hya所观察到的那样，即使在气体严重耗尽的内部区域也可能发生侵蚀。最近在HD 149026 b周围发现的气体匮乏区域中，通过光致侵蚀对尘埃进行再处理，为气体匮乏的巨行星的大核心的生长提供了一种可能的解释。
英文摘要：
Laboratory experiments show that a solid-state greenhouse effect in combination with thermophoresis can efficiently erode a dust bed in a low-pressure gaseous environment. The surface of an illuminated, light absorbing dusty body is cooler than the dust below the surface (solidstate greenhouse effect). This temperature gradient leads to a directed momentum transfer between gas and dust particles and the dust particles are subject to a force towards the surface(thermophoresis). If the thermophoretic force is stronger than gravity and cohesion, dust particles are ejected. Applied to protoplanetary discs, dusty bodies smaller than several kilometres in size which are closer to a star than about 0.4 au are subject to a rapid and complete disassembly to submillimetre size dust aggregates by this process. While an inward-drifting dusty body is destroyed, the generated dust is not lost for the disc by sublimation or subsequent accretion on to the star but can be reprocessed by photophoresis or radiation pressure. Planetesimals cannot originate through aggregation of dust inside the erosion zone. If objects larger than several kilometres already exist, they prevail and further grow by collecting dust from disassembled smaller bodies. The pile-up of solids in a confined inner region of the disc, in general, boosts the formation of planets. Erosion is possible in even strongly gas-depleted inner regions as observed for TW Hya. Reprocessing of dust through light-induced erosion offers one possible explanation for growth of large cores of gas-poor giant planets in a gas-starved region as recently found around HD 149026b.
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